Ventilation is of the utmost importance to ensure an adequate quality of indoor air, since it allows to renew the air in a home, thus minimizing health problems related to humidity and mold, pathologies that normally appear in homes with poor ventilation.
The vast majority of Portuguese buildings have natural ventilation, that is, they promote ventilation inside spaces without the use of mechanical equipment, which on the one hand allows to reduce the costs associated with this parameter, but on the other hand makes it difficult to ensure a renovation value. adequate air.
How does ventilation work in a home?
Ventilation can be natural, mechanical or mixed, depending on the type of equipment that promotes it.
- In the case of natural ventilation, it occurs through openings in the surroundings, windows and / or other holes for this purpose, and the extraction of air occurs through chimneys;
- In the case of mechanical ventilation, there are extractors that operate 24 hours a day to ensure the insufflation and extraction of air, varying the air extraction capacity that these facilities have throughout the day, for example, during peak hours there is a greater capacity for extraction to cope with baths and meals, making it necessary to inflate and extract a greater amount of air.
- Mixed ventilation occurs when there is natural and mechanical ventilation, that is, fresh air enters through the openings in the surroundings and is extracted through exhaust fans and extractors in the bathroom.
Mechanical ventilation ensures better control over air renewal conditions, however, there are costs associated with the operation of the equipment that must be evaluated in a cost-benefit analysis of the solution.
Consumo de energia na ventilação
A ventilação é responsável por aproximadamente 50% das perdas de energia numa habitação. Quanto maior a quantidade de ar renovada por hora, maior será o consumo de energia.
Reduzir a ventilação natural
Em casas com janelas de correr ou degradadas, ocorrem infiltrações de ar acima do desejável. Pode reduzir a renovação do ar interior (para valores entre 0,4 e 0,6 Rph), substituindo ou reparando as janelas existentes.
Reduzindo as renovações de ar por hora para valores entre 0,4 e 0,6 Rph, é possível reduzir o consumo de energia com a climatização em 25%.